Subnetting legacy Class B networks

[Pierre Thibaudeau <]

Hi,

It was recently brought to our attention that RIPE have started to break
down some legacy Class B networks and assign individual subnets thereof: 

   inetnum:  130.243.32.0 - 130.243.63.255
   netname:  SE-DU
   descr:    Dalarna University
   country:  SE
   admin-c:  ANNO1-RIPE
   tech-c:   ANNO1-RIPE
   status:   ASSIGNED PA
   mnt-by:   SUNET-MNT
   changed:  fredrik@localhost 19981202
   source:   RIPE

This raises routability problems because many backbone operators filter
out BGP announcements of this range with prefix length longer than /16.
See for example <http://www.sprintlink.net/filter.htm>. 

And because, there is no "higher order" inetnum for the 130.243.0.0 -
130.243.255.255 so this makes no one entitled (from RIPE perspective) to
advertise the 130.243.0.0/16 to solve the routing issues.

And because of the lack of "higher order" inetnum, organisations like
Dalarna University come to believe that they have portable address space.
Portable, may be, but not necessarily routable.

This problem is even further comlicated by the fact that administration of
this /16 network does not appear to have been delegated to RIPE:

   alpha 48: whois -h whois.arin.net 130.243.0.0
   Royal Institute of Sweden (NETBLK-NORDU4)
      S-100 44 Stockholm
      SWEDEN
   
      Netname: NORDU4
      Netblock: 130.242.0.0 - 130.243.0.0
   
      Coordinator:
         Liman, Lars-Johan  (LL846-ARIN)  LIMAN@localhost
         +46 8 790 65 60 (FAX) +46 8 24 11 79
   
      Domain System inverse mapping provided by:
   
      SUNIC.SUNET.SE               192.36.148.18
      SERVER.NORDU.NET             193.10.252.19
   
      Record last updated on 16-Oct-98.
      Database last updated on 11-Dec-98 16:11:39 EDT.

Please investigate and clarify.
__

Pierre Thibaudeau                     |   e-mail:   prt@localhost
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